Re: KASAN: use-after-free Read in usbvision_v4l2_open

[Andrey Konovalov]

On Wed, Dec 11, 2019 at 5:22 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Wed, 11 Dec 2019, Dmitry Vyukov wrote:
>
> > > > By the way, do you know why syzbot sent _two_ reply messages?  One with
> > > > message ID <00000000000031a0af05995eca0b@xxxxxxxxxx> and the other with
> > > > message ID <000000000000441a4205995eca11@xxxxxxxxxx>?  It seems like
> > > > overkill.
> > >
> > > Hm, I'm not sure. Dmitry?
> >
> > I would assume it received 2 emails (second from syzkaller-bugs@
> > mailing list) and deduplication logic did not work somehow. So it
> > replied to both.
>
> Does that mean when I send in a test request, it's better to omit
> syzkaller-bugs from the CC: list?
>
> Also, whatever did happen to the most recent test request (the one sent
> to syzbot+7fa38a608b1075dfd634 even though it was meant to test the
> bug reported by syzbot+c7b0ec009a216143df30)?  Did it truly fail to
> build?  I can't find anything about it in the dashboard link for either
> bug report, and I haven't gotten a reply from syzbot.

Yes, the patch failed due to msleep() being undefined in that source
file. I'm not sure why syzbot didn't send a response. Could you try
resending the patch as the reply to that other syzbot report?